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| Dissertation / PhD Thesis/Book | PreJuSER-36741 |
2003
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/323
Report No.: Juel-4051
Abstract: The objective of this thesis was to develop a process design for on-board fuel gas generation by catalytic autothermal reforming of low-sulphur diesel fuel. The process design was optimized with regard to system weight, dynamic response and eficiency. In addition various commercial catalysts were screened in order to assess their suitability for autothermal reforming of diesel fuel. Preferable operating conditions and resulting catalyst performance were determined. Finally a reactor and operation concept was worked out for the best of the catalysts investigated. Apart from autothermal reforming partial oxidation and steam reforming were taken into consideration in the development of a suitable on-board fuel gas generation process. Starting with several promising, energetically optimized process designs, the overall system efficiency values as well as the apparatus and catalyst weights were calculated based on steady state process data at full load. Analysis of fuel gas generation processes based on steam reforming processes gave infeasible, high system weights. Partial oxidation had to be excluded due to low system efficiencies. Therefore further investigations exclusively considered autothermal reforming processes. Subsequent development of such process designs aimed at gradually reducing the system weight without loss of overall system eficiency. Using steady state system analysis for full system load the system parameter value was optimized with respect to efficiency and system weight. In order to provide a tool for investigating the fuel gas processor's dynamic behaviour a model for each relevant system unit was developed. The models were implemented into the commercial software package $\textit{MatlablSimulink}$. VWth this software the dynamic response of each system unit could then be analysed and a particular system staet-up strategy was derived from these results. This staet-up strategy was tested and optimized by means of several simulation calculations. In addition the fuel gas processor's dynamic response on load changes was simulated. On the basis of the simulation results critical fuel gas processor units were identified and the potential of innovative technologies like micro heat exchangers was estimated. Finally, a 3 kW$_{H2}$ reformer test facility was built to experimentally investigate the catalytic autothermal reforming of major diesel fuel components at realistic operation conditions. Several monoliths coated with a pre-selected catalyst were systematically tested in relevant operation ranges using this set-up. In order to characterise particular catalysts and the corresponding reforming process the reformate composition, the axial reactor temperature profile and the hydrocarbon conversion were measured. From this suitable operation regimes and tolerable space velocities could be determined.
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